Thepackaluminizedandsiliconaluminizedat620℃for6hoursonTi-alloysheetfabricated
byelectronbeamphysicalvapordeposition (EB-PVD)techniquewasinvestigated.Surfacesandcross-sectionsofthealuminizedspecimenswerestudiedbyscanningelectronmicroscopy(
SEM).Phaseidentification
oftheoxidescalewasperformedbyX-raydiffraction (GAXRD)andenergydispersiveanalysisofX-rays (EDAX).Theresultsshowthataluminizingcouldbecarriedoutat620℃.ThephaseconstructionofthealuminizedcoatingisAl3Ti.
However,asAl3Tiphaseisbrittle,itiseasytocreatecrackinthecooling
processduetotheheatstress.AfterAl-Sico-infiltrationat620℃,thephasesofthecoatingareAl3Tiand
Ti5Si3.Theinterfaceisclearbutunsmooth.